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/* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Data Differential's libhostle
*
* Copyright (C) 2012 Data Differential, http://datadifferential.com/
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* * The names of its contributors may not be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <config.h>
/*
Random recv failing library for testing recv() failures.
LD_PRELOAD="/usr/lib/libdl.so ./util/libhostile_recv.so" ./binary
*/
#include <dlfcn.h>
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <time.h>
#include <stdbool.h>
#include <libhostile/initialize.h>
static int not_until= 500;
static struct function_st __function;
static pthread_once_t function_lookup_once = PTHREAD_ONCE_INIT;
static void set_local(void)
{
__function= set_function("recv", "HOSTILE_RECV");
}
void set_recv_close(bool arg, int frequency, int not_until_arg)
{
if (arg)
{
__function.frequency= frequency;
not_until= not_until_arg;
}
else
{
__function.frequency= 0;
not_until= 0;
}
}
ssize_t recv(int sockfd, void *buf, size_t len, int flags)
{
hostile_initialize();
(void) pthread_once(&function_lookup_once, set_local);
if (is_getaddrinfo() == false && __function.frequency)
{
if (--not_until < 0 && rand() % __function.frequency)
{
shutdown(sockfd, SHUT_RDWR);
close(sockfd);
errno= 0;
#if 0
perror("HOSTILE CLOSE() of socket during recv()");
#endif
return 0;
}
}
return __function.function.recv(sockfd, buf, len, flags);
}
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